BおよびCの花器のアイデンティティ機能には,SEPALLATA MADS-box遺伝子が必要である
S Pelaz1, G S Ditta, E Baumann
1Section of Cell and Developmental Biology, La Jolla, California 92093-0116, USA.
Nature
|May 23, 2000
まとめ
SEPALLATA遺伝子は花の発達に不可欠である. SEP1/2/3の遺伝子を欠いている三重変異のアラビドプシスは,花のみの花を育み,花,茎,の形成におけるその役割を明らかにする.
科学分野:
- 植物発達生物学 植物発達生物学
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- 花の器官のアイデンティティは,植物の発達の根本的な側面です.
- ABCモデルは,花の臓器の種類が,ホメオティックな遺伝子によってどのように規定されているかを説明します.
- この過程における特定の遺伝子クラスの正確な役割は,まだ完全に解明されていない.
研究 の 目的:
- アラビドプシスの花の発達におけるSEPALLATA (SEP) 遺伝子の機能を調査する.
- SEP遺伝子と臓器同一性のABCモデルとの関係を決定する.
- 花の臓器タイプを特定するSEP遺伝子の役割を特定する.
主な方法:
- SEP1,SEP2,SEP3遺伝子の活性が欠けている三重変異のアラビドプシス植物の分析.
- 野生型の植物と突然変異した植物における花の器官の表型的特徴.
- 遺伝子の冗長性と機能を理解するための遺伝分析.
主要な成果:
- 3つのSEP遺伝子 (SEP1/2/3) を欠いているアラビドプシスの植物には,花の器官の完全なホメオティックな変異が表れます.
- トリプルミュータントのすべての花器官は,分枝状に発達する.
- SEP遺伝子の活動は,花びら,茎,の適切な発達に不可欠です.
結論:
- SEP1,SEP2,SEP3は,機能的に冗長なMADS-box遺伝子で,花の臓器のアイデンティティに不可欠です.
- SEP遺伝子は,花,茎,の発達に必要な臓器同一性遺伝子のクラスとして機能する.
- これらの発見は,花の臓器特異化におけるSEP遺伝子の不可欠な役割を強調することによって,ABCモデルを拡張します.
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